1 /* $OpenBSD: adjacency.c,v 1.26 2016/06/18 17:31:32 renato Exp $ */ 2 3 /* 4 * Copyright (c) 2013, 2015 Renato Westphal <renato@openbsd.org> 5 * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org> 6 * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org> 7 * Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org> 8 * 9 * Permission to use, copy, modify, and distribute this software for any 10 * purpose with or without fee is hereby granted, provided that the above 11 * copyright notice and this permission notice appear in all copies. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 20 */ 21 22 #include <sys/types.h> 23 #include <arpa/inet.h> 24 #include <stdlib.h> 25 #include <string.h> 26 27 #include "ldpd.h" 28 #include "ldpe.h" 29 #include "log.h" 30 31 static void adj_del_single(struct adj *); 32 static void adj_itimer(int, short, void *); 33 static void tnbr_del(struct tnbr *); 34 static void tnbr_hello_timer(int, short, void *); 35 static void tnbr_start_hello_timer(struct tnbr *); 36 static void tnbr_stop_hello_timer(struct tnbr *); 37 38 struct adj * 39 adj_new(struct in_addr lsr_id, struct hello_source *source, 40 union ldpd_addr *addr) 41 { 42 struct adj *adj; 43 44 log_debug("%s: lsr-id %s, %s", __func__, inet_ntoa(lsr_id), 45 log_hello_src(source)); 46 47 if ((adj = calloc(1, sizeof(*adj))) == NULL) 48 fatal(__func__); 49 50 adj->lsr_id = lsr_id; 51 adj->nbr = NULL; 52 adj->source = *source; 53 adj->trans_addr = *addr; 54 55 evtimer_set(&adj->inactivity_timer, adj_itimer, adj); 56 57 LIST_INSERT_HEAD(&global.adj_list, adj, global_entry); 58 59 switch (source->type) { 60 case HELLO_LINK: 61 LIST_INSERT_HEAD(&source->link.ia->adj_list, adj, ia_entry); 62 break; 63 case HELLO_TARGETED: 64 source->target->adj = adj; 65 break; 66 } 67 68 return (adj); 69 } 70 71 static void 72 adj_del_single(struct adj *adj) 73 { 74 log_debug("%s: lsr-id %s, %s (%s)", __func__, inet_ntoa(adj->lsr_id), 75 log_hello_src(&adj->source), af_name(adj_get_af(adj))); 76 77 adj_stop_itimer(adj); 78 79 LIST_REMOVE(adj, global_entry); 80 if (adj->nbr) 81 LIST_REMOVE(adj, nbr_entry); 82 switch (adj->source.type) { 83 case HELLO_LINK: 84 LIST_REMOVE(adj, ia_entry); 85 break; 86 case HELLO_TARGETED: 87 adj->source.target->adj = NULL; 88 break; 89 } 90 91 free(adj); 92 } 93 94 void 95 adj_del(struct adj *adj, uint32_t notif_status) 96 { 97 struct nbr *nbr = adj->nbr; 98 struct adj *atmp; 99 100 adj_del_single(adj); 101 102 /* 103 * If the neighbor still exists but none of its remaining 104 * adjacencies (if any) are from the preferred address-family, 105 * then delete it. 106 */ 107 if (nbr && nbr_adj_count(nbr, nbr->af) == 0) { 108 LIST_FOREACH_SAFE(adj, &nbr->adj_list, nbr_entry, atmp) 109 adj_del_single(adj); 110 session_shutdown(nbr, notif_status, 0, 0); 111 nbr_del(nbr); 112 } 113 } 114 115 struct adj * 116 adj_find(struct hello_source *source) 117 { 118 struct adj *adj; 119 120 LIST_FOREACH(adj, &global.adj_list, global_entry) { 121 if (adj->source.type != source->type) 122 continue; 123 124 switch (source->type) { 125 case HELLO_LINK: 126 if (ldp_addrcmp(source->link.ia->af, 127 &adj->source.link.src_addr, 128 &source->link.src_addr) == 0) 129 return (adj); 130 break; 131 case HELLO_TARGETED: 132 if (adj->source.target == source->target) 133 return (adj); 134 break; 135 } 136 } 137 138 return (NULL); 139 } 140 141 int 142 adj_get_af(struct adj *adj) 143 { 144 switch (adj->source.type) { 145 case HELLO_LINK: 146 return (adj->source.link.ia->af); 147 case HELLO_TARGETED: 148 return (adj->source.target->af); 149 default: 150 fatalx("adj_get_af: unknown hello type"); 151 } 152 } 153 154 /* adjacency timers */ 155 156 /* ARGSUSED */ 157 static void 158 adj_itimer(int fd, short event, void *arg) 159 { 160 struct adj *adj = arg; 161 162 log_debug("%s: lsr-id %s", __func__, inet_ntoa(adj->lsr_id)); 163 164 if (adj->source.type == HELLO_TARGETED) { 165 if (!(adj->source.target->flags & F_TNBR_CONFIGURED) && 166 adj->source.target->pw_count == 0) { 167 /* remove dynamic targeted neighbor */ 168 tnbr_del(adj->source.target); 169 return; 170 } 171 adj->source.target->adj = NULL; 172 } 173 174 adj_del(adj, S_HOLDTIME_EXP); 175 } 176 177 void 178 adj_start_itimer(struct adj *adj) 179 { 180 struct timeval tv; 181 182 timerclear(&tv); 183 tv.tv_sec = adj->holdtime; 184 if (evtimer_add(&adj->inactivity_timer, &tv) == -1) 185 fatal(__func__); 186 } 187 188 void 189 adj_stop_itimer(struct adj *adj) 190 { 191 if (evtimer_pending(&adj->inactivity_timer, NULL) && 192 evtimer_del(&adj->inactivity_timer) == -1) 193 fatal(__func__); 194 } 195 196 /* targeted neighbors */ 197 198 struct tnbr * 199 tnbr_new(struct ldpd_conf *xconf, int af, union ldpd_addr *addr) 200 { 201 struct tnbr *tnbr; 202 203 if ((tnbr = calloc(1, sizeof(*tnbr))) == NULL) 204 fatal(__func__); 205 206 tnbr->af = af; 207 tnbr->addr = *addr; 208 tnbr->state = TNBR_STA_DOWN; 209 tnbr->hello_holdtime = (ldp_af_conf_get(xconf, af))->thello_holdtime; 210 tnbr->hello_interval = (ldp_af_conf_get(xconf, af))->thello_interval; 211 212 return (tnbr); 213 } 214 215 static void 216 tnbr_del(struct tnbr *tnbr) 217 { 218 tnbr_stop_hello_timer(tnbr); 219 if (tnbr->adj) 220 adj_del(tnbr->adj, S_SHUTDOWN); 221 LIST_REMOVE(tnbr, entry); 222 free(tnbr); 223 } 224 225 struct tnbr * 226 tnbr_find(struct ldpd_conf *xconf, int af, union ldpd_addr *addr) 227 { 228 struct tnbr *tnbr; 229 230 LIST_FOREACH(tnbr, &xconf->tnbr_list, entry) 231 if (af == tnbr->af && 232 ldp_addrcmp(af, addr, &tnbr->addr) == 0) 233 return (tnbr); 234 235 return (NULL); 236 } 237 238 struct tnbr * 239 tnbr_check(struct tnbr *tnbr) 240 { 241 if (!(tnbr->flags & (F_TNBR_CONFIGURED|F_TNBR_DYNAMIC)) && 242 tnbr->pw_count == 0) { 243 tnbr_del(tnbr); 244 return (NULL); 245 } 246 247 return (tnbr); 248 } 249 250 void 251 tnbr_update(struct tnbr *tnbr) 252 { 253 int socket_ok, rtr_id_ok; 254 255 if ((ldp_af_global_get(&global, tnbr->af))->ldp_edisc_socket != -1) 256 socket_ok = 1; 257 else 258 socket_ok = 0; 259 260 if (leconf->rtr_id.s_addr != INADDR_ANY) 261 rtr_id_ok = 1; 262 else 263 rtr_id_ok = 0; 264 265 if (tnbr->state == TNBR_STA_DOWN) { 266 if (!socket_ok || !rtr_id_ok) 267 return; 268 269 tnbr->state = TNBR_STA_ACTIVE; 270 send_hello(HELLO_TARGETED, NULL, tnbr); 271 272 evtimer_set(&tnbr->hello_timer, tnbr_hello_timer, tnbr); 273 tnbr_start_hello_timer(tnbr); 274 } else if (tnbr->state == TNBR_STA_ACTIVE) { 275 if (socket_ok && rtr_id_ok) 276 return; 277 278 tnbr->state = TNBR_STA_DOWN; 279 tnbr_stop_hello_timer(tnbr); 280 } 281 } 282 283 void 284 tnbr_update_all(int af) 285 { 286 struct tnbr *tnbr; 287 288 /* update targeted neighbors */ 289 LIST_FOREACH(tnbr, &leconf->tnbr_list, entry) 290 if (tnbr->af == af || af == AF_UNSPEC) 291 tnbr_update(tnbr); 292 } 293 294 /* target neighbors timers */ 295 296 /* ARGSUSED */ 297 static void 298 tnbr_hello_timer(int fd, short event, void *arg) 299 { 300 struct tnbr *tnbr = arg; 301 302 send_hello(HELLO_TARGETED, NULL, tnbr); 303 tnbr_start_hello_timer(tnbr); 304 } 305 306 static void 307 tnbr_start_hello_timer(struct tnbr *tnbr) 308 { 309 struct timeval tv; 310 311 timerclear(&tv); 312 tv.tv_sec = tnbr->hello_interval; 313 if (evtimer_add(&tnbr->hello_timer, &tv) == -1) 314 fatal(__func__); 315 } 316 317 static void 318 tnbr_stop_hello_timer(struct tnbr *tnbr) 319 { 320 if (evtimer_pending(&tnbr->hello_timer, NULL) && 321 evtimer_del(&tnbr->hello_timer) == -1) 322 fatal(__func__); 323 } 324 325 struct ctl_adj * 326 adj_to_ctl(struct adj *adj) 327 { 328 static struct ctl_adj actl; 329 330 actl.af = adj_get_af(adj); 331 actl.id = adj->lsr_id; 332 actl.type = adj->source.type; 333 switch (adj->source.type) { 334 case HELLO_LINK: 335 memcpy(actl.ifname, adj->source.link.ia->iface->name, 336 sizeof(actl.ifname)); 337 break; 338 case HELLO_TARGETED: 339 actl.src_addr = adj->source.target->addr; 340 break; 341 } 342 actl.holdtime = adj->holdtime; 343 actl.trans_addr = adj->trans_addr; 344 345 return (&actl); 346 } 347